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Proper way to implement a custom a taskListener in Activiti?

jpotts

I want to implement a custom taskListener that leverages the ActionService. I have written a Java class that implements TaskListener. The problem I'm having is how to properly inject the dependency and how to refer to the taskListener from the process definition.

I tried creating the following in one of my context files:

<bean id="externalReviewNotification" class="com.someco.bpm.ExternalReviewNotification">
        <property name="actionService">
            <ref bean="ActionService" />
        </property>
</bean>‍‍‍‍‍

I've also tried a version that includes "parent="baseJavaDelegate"".

I then refer to the bean from my process using delegateExpression, like this:

<activiti:taskListener event="create" delegateExpression="${externalReviewNotification}"></activiti:taskListener>‍

That fails with a org.activiti.engine.ActivitiException: Exception while invoking TaskListener: Unknown property used in expression

I think it is because my bean isn't registered with the activiti bean registry, but I'm not sure.

I've tried using a class attribute instead of the delegateExpression attribute. In that case, notify is called, but my dependencies aren't loaded since it isn't using the bean.

I looked at the source to see how the JavaScript taskListener works. It has a getServiceRegistry method. I suppose I could implement that, but I'm wondering if there's a better way?

Jeff

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Comments

michalwrobel

Hi,

I tried to implement similar thing as you, but using Activiti ServiceTask, and had the same problems as you.

'activiti:class' way worked fine, and delegateExpression had not. I've also implemented my own class which registered in activitiBeanRegistry, without utilizing baseJavaDelegate bean.

The only way I've found to evade this problem was to manually register my bean in activiti-context.xml by adding new entry to activitiBeanRegistry map:

 <util:map id="activitiBeanRegistry" map-class="java.util.HashMap">
        <entry key="services" value-ref="ServiceRegistry" />
    <entry key="simpleLoggerServiceTask" value-ref="simpleLoggerServiceTask" />
        
    </util:map>
‍‍‍‍‍‍‍

Just like classes utilising activitiBeanRegistry couldn't reach runtime updates in this map..

The important thing is that both key and value-ref have to have the same value - id of the bean.

I see you have released workflow tutorial yesterday and just scrolled through it, but haven't found there utilising java classes in workflows the way we are talking here about.
Have you figured out how to do it, or have you given up for the moment?
Or is this issue now officially bug?

jpotts

In the tutorial I use a taskListener that refers to the class by name:

<activiti:taskListener event="create" class="com.someco.bpm.ExternalReviewNotification"></activiti:taskListener>‍

And then within the class I have a getServiceRegistry method that I stole from ActivitiScriptBase.java. It retrieves the service registry so I can have access to Alfresco's services:

protected ServiceRegistry getServiceRegistry() {
        ProcessEngineConfigurationImpl config = Context.getProcessEngineConfiguration();
        if (config != null) {
            // Fetch the registry that is injected in the activiti spring-configuration
            ServiceRegistry registry = (ServiceRegistry) config.getBeans().get(ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);
            if (registry == null) {
                throw new RuntimeException(
                            "Service-registry not present in ProcessEngineConfiguration beans, expected ServiceRegistry with key" + 
                            ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);
            }
            return registry;
        }
        throw new IllegalStateException("No ProcessEngineCOnfiguration found in active context");
    }   ‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Jeff

amandaluniz_z

I faced the same problem and found the same work around (register the bean manually overriding the activitiBeanRegistry).

This is not the best solution as if you have more than one module, and want to register beans within the AMP file not in shared/classes/alfresco/extension… There'll be a workflow that won't work.

I've already raised a ticket with Alfresco Support, fingers crossed they fix that!

Regards,
Adei

amandaluniz_z

Alfresco engineers have come back to me in this matter.

According to them, it's not the spring bean id the one we need to put in the delegateExpression property but the base name of the java class (for Jeff's example if would be ExternalReviewNotification)

pero

According to them, it's not the spring bean id the one we need to put in the delegateExpression property but the base name of the java class (for Jeff's example if would be ExternalReviewNotification)

So has anyone else tried this solution? I've tried it and it still doesn't work.

amandaluniz_z

I haven't tried it, to be honest.

The previous one, overriding the bean, works.

Adei

pero

I faced the same problem and found the same work around (register the bean manually overriding the activitiBeanRegistry).

This is not the best solution as if you have more than one module, and want to register beans within the AMP file not in shared/classes/alfresco/extension… There'll be a workflow that won't work.

I've already raised a ticket with Alfresco Support, fingers crossed they fix that!

Regards,
Adei

Could you post a link to that Jira ticket so we can vote on it?

amandaluniz_z

Sorry, didn't create a JIRA ticket, I meant an Alfresco Support ticket

pero

Sorry, didn't create a JIRA ticket, I meant an Alfresco Support ticket

Ah. Ok then. You let us know when they fix it

checco

Hi all,
i have found this topic very interesting, i think that you can help me especially when i read this:

I tried to implement similar thing as you, but using Activiti ServiceTask, and had the same problems as you.

'activiti:class' way worked fine….

because i can't run any Activiti ServiceTask using activiti:class attribute.

Let me explain, my process definition is very simple:

<process id="MySampleServiceTask" name="MySampleServiceTask">
    <startEvent id="alfrescoStartevent1" name="Alfresco start" activiti:formKey="bpm:startTask"></startEvent>
    <serviceTask id="servicetask1" name="Service Task" activiti:class="workflow.sample.serviceTask.HelloWorldServiceTask"></serviceTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="servicetask1" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="alfrescoStartevent1" targetRef="servicetask1"></sequenceFlow>
  </process>
‍‍‍‍‍‍‍‍‍

and the HelloWorldServiceTask is even simpler:

package workflow.sample.serviceTask;

import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.JavaDelegate;

public class HelloWorldServiceTask implements JavaDelegate {

   public HelloWorldServiceTask() {
      System.out.println("HelloWorldServiceTask created");
   }

   @Override
   public void execute(DelegateExecution arg0) throws Exception {
      System.out.println("Hello Wolrd!");
   }

}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

I have put my HelloWorldServiceTask class in a jar in the folder $TOMCAT_HOME/shared/lib/
Started Alfresco and deployed process definition using Activiti Workflow Console
But when i try to start the workflow from Alfresco Share web application it doesn't work: the workflow doesn't start and a pupup is opened with the message 'Impossible to start workflow'.
I have try to set the logging level to debug (log4j.logger.org.alfresco.repo.workflow=debug) to have more information but nothing is logged.

Do you have any idea what i'm doing wrong? I missing some configuration?
How can i have a more detailed error message?

Thanks,
Francesco

checco

I have partially resolved my problem. I have Used Alfresco workflow console (http://localhost:8080/alfresco/faces/jsp/admin/workflow-console.jsp) to start my process and a ClassNotfoundException was raised so i have moved my jar with my classes in $TOMCAT_HOME/webapps/alfresco/WEB-INF/lib.

Now when i try to start a new instance of the process the HelloWorldServiceTask is created and his execution(…) method is invoked because i can see the output in the console, but after that an exception is raise and the Alfresco Workflow Console shows the message: org.alfresco.service.cmr.workflow.WorkflowException: 05110007 Workflow path activiti$3205 does not exist.
It seems that the problem is between the serviceTask and the endEvent transition…

The message is not logged in alfresco.log file, is there another configuration in addition to log4j.logger.org.alfresco.repo.workflow=debug in order to log also that message?

Francesco

kavilash23

Hi Francesco,

Try adding this line in log4j.properties

log4j.logger.workflow.sample.serviceTask.HelloWorldServiceTask=debug

checco

Thanks,
I have just resolved the problem by adding only a userTask after the serviceTask and everything works fine!

Now i facing the problem of the delegate expression: i have tried either the bean id and the base name of the executor class but it dosen't works.

I finally adopted the jeff's solution, using the activiti:class attribute and the getServiceRegistry method.

wgcox

We ran into the issue of trying to call 'delegate' from an Activiti workflow in Alfresco 4.0.1 (haven't tried this in 4.0.2 yet). I looked at the 'invitation-nominated' workflow as an example, as it makes use of delegates. However, our delegate was not accessible from the workflow. We worked through a couple of issues and got it to work, and hopefully this is helpful to folks:

1) Your bean must be registered in the activitiBeanRegistry. This is a Map that uses the class name (as a String) as the key, with the class object as the value in the Map. The important thing here is that your bean id name should exactly match your class name (e.g. - case sensitive) so that it matches in the Map.

2) If your class extends the BaseJavaDelegate class, your class should get added to the activitiBeanRegistry. However, this was not working for us. I attached a debugger, and I never saw my class getting added to the map. We resolved this by making our custom class' bean dependent on the activitiBeanRegistry. So, it looks like there is an order of initialization issue here if you don't do this.

We have bunch of classes that we're calling, so we just used an abstract bean that was dependent on the 'activitiBeanRegistry', and then our classes had the abstract bean as a parent (your Java class still extends BaseJavaDelegate, though).

Here is a snippet of the Spring config:

<bean id="AbstractWorkflowDelegate" parent="baseJavaDelegate" abstract="true" depends-on="activitiBeanRegistry"/>
    
    
    <bean id="MyCustomClass" parent="AbstractWorkflowDelegate" class="com.bluefishgroup.alf.workflow.MyCustomClass"/>
     
    <!– A bunch of additional classes defined as well –>
‍‍‍‍‍‍‍

And then, in the source code, my class needs to still extend BaseJavaDelegate:

import org.alfresco.repo.workflow.activiti.BaseJavaDelegate;

public class MyCustomClass extends BaseJavaDelegate
‍‍‍‍‍

ungawunga

Thanks for posting that, but it hasn't solved my problem. All the combinations I've found in the forums and tried has not gotten me a reference to the ServiceRegistry. I am implementing an ExecutionListener, and my object does get called from the workflow, so I know that part is correct. But when my object's 'notify' method is called, it never gets a non-null return from BaseJavaDelegate.getServiceRegistry().

What is the magic Spring incantation I'm missing here?

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>

<beans>
   <bean id="AbstractWorkflowDelegate" parent="baseJavaDelegate" abstract="true" depends-on="activitiBeanRegistry" />
 
   <bean id="MyIssuePost" class="com.epnet.alfresco.metadata.listener.MyIssuePost" parent="AbstractWorkflowDelegate">
      <property name="serviceRegistry" ref="ServiceRegistry" />
   </bean>

<!–  this didn't work either    
    <bean id="com.epnet.metadata.listener.MyIssuePost" class="com.epnet.alfresco.metadata.listener.MyIssuePost">
      <property name="serviceRegistry" ref="ServiceRegistry" />
   </bean>
 –>
</beans>

‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

scundall

I am facing same problem as UngaWUnga do

My code is…

public abstract class DmsCommonListener {

   final static protected String DMS_LOG_MARKER = "### DMS ###";

   @Autowired
   @Qualifier("ServiceRegistry")
   private ServiceRegistry serviceRegistry;
   
   /**
    * @param serviceRegistry
    *            the serviceRegistry to set
    */
   @Required  //I combined it to just somehow make it work:-)
   public void setServiceRegistry(ServiceRegistry serviceRegistry) {
      this.serviceRegistry = serviceRegistry;
   }

   /**
    * @return the serviceRegistry
    */
   public ServiceRegistry getServiceRegistry() {
      return serviceRegistry;
   }

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:annotation-config />
   <context:component-scan base-package="com.tieto" />

   <bean id="DmsCustomMailer" class="com.tieto.workflow.util.DmsCustomMailer"></bean>
   <bean id="DmsCommonListenerBean" class="com.tieto.workflow.DmsCommonListener" abstract="true">
      <property name="workflowService">
         <ref bean="WorkflowService" />
      </property>
      <property name="serviceRegistry">
         <ref bean="ServiceRegistry" />
      </property>
   </bean>

<bean id="DmsCommonTaskListenerBean" class="com.tieto.workflow.DmsCommonTaskListener" abstract="true" parent="DmsCommonListenerBean" />
   <bean id="DmsCommonExecutionListenerBean" class="com.tieto.workflow.DmsCommonExecutionListener" abstract="true" parent="DmsCommonListenerBean" />

   <!– INIT –>
   <bean id="InitTaskListenerBean" class="com.tieto.workflow.init.TaskListener" parent="DmsCommonTaskListenerBean" />
   <bean id="InitExecutionListenerBean" class="com.tieto.workflow.init.ExecutionListener" parent="DmsCommonExecutionListenerBean" />
   <!– ELABORATION –>
   <bean id="ElaborationTaskListenerBean" class="com.tieto.workflow.elaboration.TaskListener" parent="DmsCommonTaskListenerBean" />

‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

cafebabe

By registering the bean with activeRegistry, I was able to invoke it using the "delegateExpression" attribute as shown above.
But if I try to auto-wire a custom service class inside ExternalReviewNotification, then that class is not getting instantiated.
<blockcode>
<util:map id="activitiBeanRegistry" map-class="java.util.HashMap">
    <entry key="services" value-ref="ServiceRegistry" />
    <entry key="externalReviewNotification" value-ref="externalReviewNotification" />
    </util:map>

<bean id="externalReviewNotification" class="com.someco.bpm.ExternalReviewNotification"
depends-on="activitiBeanRegistry">
   <property name="myActionService">
      <ref bean="myActionService" />
   </property>
</bean>
<bean id="myActionService" class="com.someco.bpm.service.MyActionService"/>
</blockcode>
Please advise.

dmralfing

Sorry Jeff, but I´m afraid I didn´t understand the solution you suggested due to I´m a beginner in activity.
Please, may you tell me what I'm doing wrong in this code or else what´s the best way to get
the service registry having Alfresco 4.2.x?
This is my wf:

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="Examples">
  <process id="MyTest" name="MyTest">
   <startEvent id="theStart" name="Start">
   </startEvent>
    <serviceTask id="javaService" name="Java service invocation" activiti:class="org.activiti.examples.bpmn.test.manager2.SetterTest">
      <extensionElements>
        <activiti:field name="text">
          <activiti:string>Success</activiti:string>
        </activiti:field>
        <activiti:taskListener event="create" class="org.activiti.examples.bpmn.test.manager2.SetterTest">
        </activiti:taskListener>
      </extensionElements>
    </serviceTask>
   <userTask id="usertask1" name="User Task" activiti:candidateGroups="user"></userTask>
    
   <endEvent id="theEnd" name="End"></endEvent>
    <sequenceFlow id="flow1" name="" sourceRef="theStart" targetRef="javaService"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="javaService" targetRef="usertask1"></sequenceFlow>    
    <sequenceFlow id="flow4" name="" sourceRef="usertask1" targetRef="theEnd"></sequenceFlow>
  </process>
</definitions>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

..and this is my class that unaffortunately doesn´t get the serviceRegistry..

package org.activiti.examples.bpmn.test.manager2;
import …
……….
public class SetterTest implements JavaDelegate {
 
   private static final String VARIABLE_NAME = "testVariable";
   private Expression text;
   ServiceRegistry serviceRegistry=null;
   //public ServiceRegistry getServiceRegistry() {return serviceRegistry;}
   protected ServiceRegistry getServiceRegistry() {

        ProcessEngineConfigurationImpl config = Context.getProcessEngineConfiguration();
        if (config != null) {
            ServiceRegistry registry = (ServiceRegistry) config.getBeans().get(ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);
            if (registry == null) {
                throw new RuntimeException(
                            "Service-registry not present in ProcessEngineConfiguration beans, expected ServiceRegistry with key" + 
                            ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);
            }
            else
               System.out.println("————— config =null");
            return registry;
        }

        throw new IllegalStateException("No ProcessEngineCOnfiguration found in active context");

    }   
   public void setServiceRegistry(ServiceRegistry serviceRegistry) {this.serviceRegistry = serviceRegistry;}
   public void execute(DelegateExecution execution) 
   {
         if (serviceRegistry==null)
            System.out.println("serviceRegistry is null!!");
   }
}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Thank you so much!

rasm

I described an example of doing above here: http://experiencewithalfresco.blogspot.dk/2014/08/using-bean-instanciated-tasklistener-in.html

divakar

I am not getting the flow through to my ExecutionListener defined in the process. My process definition has the following piece in the bpmn xml.

<sequenceFlow id="toFinanceReview" name="Goes To Finance Review" sourceRef="exclusivegateway1" targetRef="financeReview">
<extensionElements>
<activiti:executionListener event="take" delegateExpression="${emailListener}"></activiti:executionListener>
</extensionElements>
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${managerDecision == 'approve'}]]></conditionExpression>
</sequenceFlow>
——————————————————-
The EmailListener Class is given below

@Component
public class EmailListener implements ExecutionListener {

private static final long serialVersionUID = 1L;

@Autowired
EmailService emailService;

@Override
public void notify(DelegateExecution execution) throws Exception {
Map<String, Object> processVariableMap = execution.getVariables();
emailService.sendEmail(processVariableMap);

}

}

———————

During server start up, the bean for EmailListener is created as follows in one of the config Class

@Bean
public EmailListener emailListener() {
return new EmailListener();
}

————————–

But when the process flow reaches the sequence, the flow never reaches the EmailListener class. I always get the following Exception.I am struck here for two days now. I have also attached the exception I got.

When I debugged my application, I found the value of beanFactory as null in the SpringBeanFactoryProxyMap.

Please point me out where i am going wrong. Any help is greatly appreciated. Thanks in advance.
attachment

Exception_1.txt.zip

akanksha27mishr

Hi,
I'm working on a custom workflow but there is a warning "Unknown Property used in expression: ${bpm_assignee.properties.userName} " while uploading the xml in activiti explorer. The line of code that is culprit for this warning is:
<userTask id="reviewTask" name="Review Task" activiti:assignee="${bpm_assignee.properties.userName}" activiti:formKey="wf:activitiReviewTask">

Whereas, if I'm trying with hardcoding the assignee value then it working fine. But I want it in parameterized form.

Please help me out. Thanks a tone in advance !!

Regards
Akanksha